/*
 * Copyright 2002-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.bind.annotation;

import java.lang.annotation.*;

/**
 * Annotation which indicates that a method parameter should be bound to an HTTP cookie.
 * Supported for annotated handler methods in Servlet and Portlet environments.
 *
 * <p>The method parameter may be declared as type {@link javax.servlet.http.Cookie}
 * or as cookie value type (String, int, etc).
 *
 * @author Juergen Hoeller
 * @see RequestMapping
 * @see RequestParam
 * @see RequestHeader
 * @see org.springframework.web.bind.annotation.RequestMapping
 * @see org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter
 * @see org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter
 * @see org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerAdapter
 * @since 3.0
 */
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface CookieValue {

    /**
     * The name of the cookie to bind to.
     */
    String value() default "";

    /**
     * Whether the header is required.
     * <p>Default is {@code true}, leading to an exception being thrown
     * in case the header is missing in the request. Switch this to
     * {@code false} if you prefer a {@code null} in case of the
     * missing header.
     * <p>Alternatively, provide a {@link #defaultValue}, which implicitly sets
     * this flag to {@code false}.
     */
    boolean required() default true;

    /**
     * The default value to use as a fallback. Supplying a default value implicitly
     * sets {@link #required} to {@code false}.
     */
    String defaultValue() default ValueConstants.DEFAULT_NONE;

}
